The Content Of The Article:
Yellow boards, also called glue boards or yellow traps, are yellow sheets of thin cardboard or plastic painted with non-drying adhesives. They are available with eyelets for hanging and also as stickers to put in flowerpots.
One uses yellow boards above all, in order to detect a pest infestation on different useful and ornamental plants in time to initiate more effective control measures. However, the panels catch only insects capable of flying or bouncing, such as the cherry fruit fly and the walnut fruit fly, the cherry vinegar fly, the whitefly, the carrot fly, the blackthorn, the rhododendron cicadas and many others. For this so-called monitoring, the panels are hung in good time before the start of the flight of insect pests and the infestation is monitored daily. It is important that the panels hang very close to the endangered plant parts. A distance of 20 centimeters should not be exceeded.
If yellow boards are used for larger plants such as sweet cherries to monitor an infestation with the cherry fruit fly, depending on the size of the treetop, at least three to ten yellow boards are well distributed to the branches, but predominantly on the south side, as experience has shown that the insects are significantly more active here, It is important that one exchanges yellow boards in time, since their adhesive effect decreases over time and they are at some point too densely covered with insects. Depending on the location, experts recommend an exchange after one to two weeks.
Different colors and shapes
The attraction of the yellow boards is mainly due to the color. It is very attractive to most pest insects. However, some panels for special purposes, for example, against thrips, often still provided with an attractant. Depending on the pest, other colors and shapes are sometimes used. In the asparagus fly, for example, it has been found that it flies especially on green, stick-shaped glue traps. Certain types of thrips can even be effectively countered with blue charts. Finally, the glue ring is also a separate variant to catch the flightless females of the Small Frostbite when they climb the tree trunk.
Certain yellows attract sciarids, leafminers, whiteflies and winged aphids, while blue attracts thrips in particular
In most cases, the yellow panel capture results are not sufficient to effectively control a pest infestation. In the cherry fruit fly, for example, only a small part of the pest insects are intercepted. In professional tomato growing, on the other hand, you can achieve great success in fighting the white fly on Sicily by setting up several square meters of yellow traps. In the home garden, for example, it is possible to lower the infestation with the rhododendron cicada to a bearable level with the help of gel tablets. Even sciarid mosquitoes on houseplants can be handled quite well with yellow sticks.
It is important that the used gel sheets are suitable for the respective application. If, for example, you want to monitor the pest infestation in the field, you should if possible be yellow plastic panels with water-insoluble adhesives. For the greenhouse or conservatory is also the classic, coated with glue cardboard.
Yellow sheets and beneficials
When using yellow boards in the field, it is often criticized that the glue traps catch many useful insects - but this is only partially correct. Bees, bumblebees, hoverflies and other flower pollinators are very rarely put on a glittering board because they are mainly fixed on flowers and nectar air. Web wasps are occasionally caught because they try to parasitize the trapped insects. However, smaller and larger flies are by far the most common "by-catches".
A yellow board indicates when a pest such as the winged aphid frequently appears
Make yellow sheets yourself
It is also very easy to make gluing boards and stickers yourself - for example, you can test other color and shape variants that are not available for sale in the trade. For the glue you need 100 grams of rosin, 60 grams of vegetable oil and 20 grams of turpentine. Rosin is a distillate extract of pine resin. It is used, inter alia, as a bow resin for stringed instruments, as a base for cosmetics and as a flux during soldering. To make the glue, heat all three ingredients in an old pot and mix well with each other. By adding more vegetable oil or rosin, the glue becomes more fluid or solid.
As a carrier for the glue serves yellow or other colored cardboard, for example, construction paper from the craft supplies. If it needs to be weatherproof, you can laminate it or just put it in a plastic wrap.Alternatively, you can use the same colored plastic - for example, the backs of school plastic high-speed staplers, which are available for little money in the stationery trade. Another advantage of plastic boards is that they can be brushed several times with new glue - even if the scraping of the old surface is not for everyone. The boards are punched on top so you can hang them up well. Then spread the warm liquid glue on the surface with a brush and let it cool on the board until it does not drip any more. The glue remains sticky for about two weeks, after which it should be renewed.